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📄 a64l.3(4.79 KB)
📄 a64l.c(846 B)
📄 abort.3(2.55 KB)
📄 abort.c(2.76 KB)
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📄 abs.c(1.84 KB)
📄 alloca.3(2.8 KB)
📄 at_quick_exit.3(2.12 KB)
📄 atexit.3(3.25 KB)
📄 atexit.c(6.73 KB)
📄 atexit.h(1.76 KB)
📄 atof.3(2.77 KB)
📄 atof.c(2.17 KB)
📄 atoi.3(2.59 KB)
📄 atoi.c(2.16 KB)
📄 atol.3(3.16 KB)
📄 atol.c(2.17 KB)
📄 atoll.c(2.05 KB)
📄 bsearch.3(4.53 KB)
📄 bsearch.c(3.35 KB)
📄 bsearch_b.c(1.38 KB)
📄 cxa_thread_atexit.c(1.67 KB)
📄 cxa_thread_atexit_impl.c(4.63 KB)
📄 div.3(2.22 KB)
📄 div.c(3 KB)
📄 exit.3(3.66 KB)
📄 exit.c(2.72 KB)
📄 getenv.3(5.32 KB)
📄 getenv.c(17.03 KB)
📄 getopt.3(7.57 KB)
📄 getopt.c(4.22 KB)
📄 getopt_long.3(11.45 KB)
📄 getopt_long.c(16.41 KB)
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📄 getsubopt.c(3.13 KB)
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📄 hcreate.c(2.23 KB)
📄 hcreate_r.c(2.27 KB)
📄 hdestroy_r.c(1.6 KB)
📄 heapsort.c(6.63 KB)
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📄 insque.c(925 B)
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📄 merge.c(9.27 KB)
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📄 ptsname.3(4.64 KB)
📄 ptsname.c(3.29 KB)
📄 qsort.3(9.67 KB)
📄 qsort.c(6.32 KB)
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📄 qsort_s.c(147 B)
📄 quick_exit.3(2.13 KB)
📄 quick_exit.c(2.53 KB)
📄 radixsort.3(4.35 KB)
📄 radixsort.c(7.89 KB)
📄 rand.3(4.31 KB)
📄 rand.c(4.58 KB)
📄 random.3(5.11 KB)
📄 random.c(17.58 KB)
📄 random.h(2.91 KB)
📄 reallocarray.3(3.75 KB)
📄 reallocarray.c(1.38 KB)
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📄 reallocf.c(1.83 KB)
📄 realpath.3(3.73 KB)
📄 realpath.c(6.32 KB)
📄 remque.c(581 B)
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📄 set_constraint_handler_s.c(2.91 KB)
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📄 strtod.3(5.87 KB)
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📄 strtonum.3(3.45 KB)
📄 strtonum.c(1.79 KB)
📄 strtoq.c(1.97 KB)
📄 strtoul.3(5.17 KB)
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📄 strtoull.c(3.75 KB)
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📄 strtouq.c(1.98 KB)
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📄 tdelete.c(5.53 KB)
📄 tfind.c(1.06 KB)
📄 tsearch.3(5.43 KB)
📄 tsearch.c(5.01 KB)
📄 tsearch_path.h(2.8 KB)
📄 twalk.c(1.18 KB)

Editing: cxa_thread_atexit_impl.c

/*-
 * Copyright (c) 2016 Mahdi Mokhtari <mokhi64@gmail.com>
 * Copyright (c) 2016, 2017 The FreeBSD Foundation
 * All rights reserved.
 *
 * Portions of this software were developed by Konstantin Belousov
 * under sponsorship from the FreeBSD Foundation.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <sys/queue.h>
#include "namespace.h"
#include <errno.h>
#include <link.h>
#include <pthread.h>
#include <stddef.h>
#include <stdlib.h>
#include <stdio.h>
#include "un-namespace.h"
#include "libc_private.h"

/*
 * C++11 introduces the thread_local scope (like __thread with some
 * additions).  As a key-feature it should support non-trivial
 * destructors, registered with __cxa_thread_atexit() to be executed
 * at the thread termination.
 *
 * The implemention keeps a _Thread_local list of destructors per each
 * thread, and calls __cxa_thread_call_dtors() on each thread's exit
 * to do cleanup.  For a thread calling exit(3), in particular, for
 * the initial thread returning from main(), we call
 * __cxa_thread_call_dtors() inside exit().
 *
 * It could be possible that a dynamically loaded library, use
 * thread_local variable but is dlclose()'d before thread exit.  The
 * destructor of this variable will then try to access the address,
 * for calling it but it's unloaded, so it'll crash.  We're using
 * __elf_phdr_match_addr() to detect and prevent such cases and so
 * prevent the crash.
 */

#define CXA_DTORS_ITERATIONS 4

struct cxa_thread_dtor {
	void *obj;
	void (*func)(void *);
	void *dso;
	LIST_ENTRY(cxa_thread_dtor) entry;
};
static _Thread_local LIST_HEAD(dtor_list, cxa_thread_dtor) dtors =
    LIST_HEAD_INITIALIZER(dtors);

int
__cxa_thread_atexit_impl(void (*dtor_func)(void *), void *obj,
    void *dso_symbol)
{

return (__cxa_thread_atexit_hidden(dtor_func, obj, dso_symbol));
}

int
__cxa_thread_atexit_hidden(void (*dtor_func)(void *), void *obj,
    void *dso_symbol)
{
	struct cxa_thread_dtor *new_dtor;

new_dtor = malloc(sizeof(*new_dtor));
	if (new_dtor == NULL) {
		errno = ENOMEM; /* forcibly override malloc(3) error */
		return (-1);
	}

new_dtor->obj = obj;
	new_dtor->func = dtor_func;
	new_dtor->dso = dso_symbol;
	LIST_INSERT_HEAD(&dtors, new_dtor, entry);
	return (0);
}

static void
walk_cb_call(struct cxa_thread_dtor *dtor)
{
	struct dl_phdr_info phdr_info;

if (_rtld_addr_phdr(dtor->dso, &phdr_info) &&
	    __elf_phdr_match_addr(&phdr_info, dtor->func))
		dtor->func(dtor->obj);
	else
		fprintf(stderr, "__cxa_thread_call_dtors: dtr %p from "
		    "unloaded dso, skipping\n", (void *)(dtor->func));
}

static void
walk_cb_nocall(struct cxa_thread_dtor *dtor __unused)
{
}

static void
cxa_thread_walk(void (*cb)(struct cxa_thread_dtor *))
{
	struct cxa_thread_dtor *dtor, *tdtor;

LIST_FOREACH_SAFE(dtor, &dtors, entry, tdtor) {
		LIST_REMOVE(dtor, entry);
		cb(dtor);
		free(dtor);
	}
}

/*
 * This is the callback function we use to call destructors, once for
 * each thread.  It is called in exit(3) in libc/stdlib/exit.c and
 * before exit_thread() in libthr/thread/thr_exit.c.
 */
void
__cxa_thread_call_dtors(void)
{
	int i;

for (i = 0; i < CXA_DTORS_ITERATIONS && !LIST_EMPTY(&dtors); i++)
		cxa_thread_walk(walk_cb_call);

if (!LIST_EMPTY(&dtors)) {
		fprintf(stderr, "Thread %p is exiting with more "
		    "thread-specific dtors created after %d iterations "
		    "of destructor calls\n",
		    _pthread_self(), i);
		cxa_thread_walk(walk_cb_nocall);
	}
}

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Editing: cxa_thread_atexit_impl.c

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